Bailongbinghe Fm
Type Locality and Naming
It was named by the Regional Survey Party under the Tibetan Geological Bureau in 1986. The naming section is located on the southern bank of the Bailongbing River (86°21′, 34°40′) of the Gaizhe County, Xizang (Tibet).
Lithology and Thickness
Its basal part is composed of thick alternate layers of grey and yellow-grey medium-bedded marls, massive bioclastic limestone and muddy limestone. Lower part is consisting of light-grey massive dolomitic limestone, intercalated with thick-bedded oolitic limestone. Middle part is light grey and grey-green muddy shale containing calcareous concretions. Upper part is alternate layers of grey thick-bedded limestone, yellow-grey medium-bedded marls together with light grey and grey-green medium-bedded mudstone and calcareous mudstone, intercalated with light-grey thin-bedded siltstone. The formation is of 2080 m in thickness.
Relationships and Distribution
Lower contact
It is in a conformable contact with the lower part of the original underlying Yanshiping Gr.
Upper contact
Its top is obscure,
Regional extent
The particular formation is distributed in the areas of the southern bank and northern slope of the Daban Divide (86°30′, 34°30′), with a consistent lithology, and representing.
GeoJSON
Fossils
In the area of the Bailongbing River it yields abundant Ammonites as represented by Berriasella sp., Virgatosphinctes minusculus. V. cf. subfrequense, V. cf. pompeckji, V. cf. kraffti, V. cf. frequense, Spiticeras sp., Aulacosphinctes sp. Paraboliceras sp., Properisphinctes. sp., Perisphinctes sp., Subplanites sp., Progeronia sp., and Alligaticeras sp. In the Bandao Lake area, it yields Corals Cladop hylliaqiebulaensis, Stylosmilia chaputi; Bivalves Chlamys cf. textoria, Gervillella siliqua, Radulopecten moondanensis, R. cf. scaburgensis; Brachiopoda Lacunosella sp., Bihenithyris sp., Juralina sp., Dorsop licathyris sp.
Age
Depositional setting
Normal shallow-sea deposits
Additional Information